A Transition Zone

Pinyon pine (Pinus monophylla) and Mojave yucca (Yucca schidigera)

Looking around the Hidden Valley you can see a number of other plants species, such as the Joshua tree
(Yucca brevifolia),
blackbrush (Coleogyne ramosissima), and many species of
cacti.
Because of the special climate and rock features found here, it is a transition
zone between the
Joshua tree forest
and the
pinyon-juniper woodlands.
In general, the oaks and pines stick to the rockier areas, while Joshua trees
and associated plants grow in the valley's center.